CONTINUOUS THERMAL TREATMENT SYSTEM FOR BRILLIANT RECOVERY OF A STAINLESS STEEL STRIP

摘要

The invention relates to a continuous thermal treatment plant for the bright annealing of a stainless steel strip, comprising at least one controlled atmosphere enclosure incorporating means for heating the strip and means for cooling the strip, the heating means and the cooling means of the strip being constituted respectively by a vertical section (3) of rapid heating induction and at least by a vertical section (4) of rapid cooling, positioned on the vertical strand, upward or downward of the metal strip, on which sections (3, 4) the strip is free of conduct, unaffected, when the strip temperature exceeds 250 degrees C. According to the invention: - said enclosure is constituted by said controlled atmosphere chamber ( 2), non-oxidizing, whose content consists of a mixture of inert gas and hydrogen or even pure hydrogen and a chamber (5) maintained under gas in providing a safety device for creating a buffer zone between the outside atmospheric air and the hydrogen-containing atmosphere to limit the insertion of outside atmospheric air into the hydrogen-containing chamber (2); a tape driving device (10) is integrated directly into said enclosure to minimize the weight of the hot spot web portion, thereby driving the web without slipping and smoothing the variations of the tensile forces on the vertical strand free driving of the metal strip, during normal operation of the line, and constituted by at least one motorized roller (11).